Sand blast system



" Feb. 27, 1934. VE Y 1,948,873

SAND BLAST SYSTEM 7 k J a g r "4 game/whom jZz f M a um 8% NW WWW Clam/M4 I Feb. 27, 1934. s. c. vEssY SAND BLAST SYSTEM Filed Feb. 21, 1931 5 Sheets-Sheet 2 l I I I" l l l h-UP I H IH I I I H H N l I s. c. vEssY 1,948,873

SAND BLAST SYSTEM Filed Feb. 21, 1931 5 Sheets-Sheet 3 Feb. 27, 1934.

Filed Feb. 21, 1931 5 Sheets-Sheet 4 Feb. 27, 1934. s. c. VESSY SAND BLAST SYSTEM Filed Feb. 21, 1931 5 Sheets-Sheet 5 Patented Feb. 27,

entree stares PATENT 0FFIE Application February 21, 1931. Serial No. 517,483-

3 Claims.

This invention relates to improvements in a sand blast system. I

A main object of my invention is to provide an mproved means for washing the abrasive and to .ccoi -plish this result with the simplest and most fficient mechanism. A further object of my inention is to provide a novel means for effecting abrasive washing within the sand blast barrel itself. A further object is to provide an improved means for projecting the abrasive against objects in such barrel. A further object is to provide an improved means for discharging abrasive from the sand blast barrel and a still further object is to provide a polygonal barrel whereby slipping or" objects constituting the charge is prevented and true tumbling is eiiected. Other and more limited objects will appear from the following description when taken in connection with the accompanying drawings and will be pointed out in the claims.

Fig. l is a front elevational View, partly diagrammatic, of a sand blast system embodying my invention; Fig. is a similar end view of the same system; 3 is a fragmentary sectional view taken longitudinally of the barrel assembly; Fig. 1 is a fragmentary view taken transversely of the barrel; Fig. 5 is a diagrammatic View corre sponding substantially to a development of a cover for the outside of the barrel, viewed from the outside; Fig. 6 is a fragmentary detail sectional view showing the connection of abrasive chute and elevator shaft; and Fig. 7 is a horizontal sectional View through the elevator shaft showing the chute in plan.

In the drawings I have indicated in more or less detail the essential parts of a complete system embodying my invention. A pair of upright table members A are mounted on any suitable base and provided at the top with bearing means B in which are iournaled trunnions C of the barrel assembly T. At one end of the barrel assembly adjacent one of the table members A is an up right elevator shaft D. At the upper end of the elevator shaft D is a hopper E into which abrasive is delivered by the elevator. Communicating with the hopper E is a suction pipe F which leads to a dust collector indicated schematically at G. At the bottom of the hopper E a transversely extending chute H which is adapted to receive abrasive material from the hopper E and deliver the same to the hopper I which is positioned thercbeneath. The hopper I communicates with a compressed air compartment J through the medium of a check valve controlled passage. Within the compressed air compartment J and communicating therewith in the usual manner are pipes leading from a source of compressed air and means for feeding abrasive material by injector action to the compressed air link K for final delivery to the distributing head L in the barrel. A valve M provided with a controlling handle N controls the compressed air line whereby the flow of abrasive laden air may be cut oli and the barrel opened to remove one charge and 9 insert another. Since the hopper I communicatcs with the compressed air compartment J only through the medium of the check valve it is obvious that abrasive delivered by the chute H cannot enter the compartment J except when the pressure is relieved by closing the valve M. .1; will be observed that one of the trunnions of the barrel is in open communication with a conduit O which also communicates with the dust collector G.

The elevator shaft D may be comprised of a plurality of vertical walls l0, 11, 12 and 13 connected together by means of angle irons 14 placed in the angle formed by the overlapping of the walls 12 and 13 over the edges of the walls 10 and 11. Mounted at the upper and lower ends of the elevator shaft are the conveyor shafts 15 and 16 upon which are mounted suitable sprockets 17 and 18 carrying a suitable conveyor 19. On one end of the shaft 15 is mounted a pulley 20 which is driven from a small pulley 21, through the medium of a belt 23, on a shaft 22 which is mounted upon the elevator shaft D. The shaft 22 is in turn driven through a pulley 2e and belt 25 from an electric motor 2e. On the shaft 22 is another pulley 27 which drives through the medium of a belt 28 a pulley 29 which is mounted on a'shaft 30 carried by the elevator shaft and also carrying a gear 31. The gear 31 meshes with the gear 32 carried by a shaft 33 mounted on the elevator shaft and carrying at its other end a gear 34- which meshes with a large gear 35 forming a part of the barrel assembly T.

Mounted upon and communicating with the elevator shaft D is a chute indicated generally by the numeral P and including a pair of parallel walls 36 and 37 having arcuate upper edges of an extent of about 90 and concentric with the axis of the barrel assembly T. Suitable end walls 38 and 39 complete the chute which has at its lower end a spout portion 40 communicating through an opening 4:1 with the interior of the elevator shaft D. The chute P is positioned parallel with and closely adjacent the large gear 35.

The pipe K may be supported at its upper end by a plate 42 secured to the table member A as 0 I objects constituting the charge.

by screws 43 and attached at its upper end to the pipe K and the distributing head conduit K by bolts 44. The conduit K extends through one of the trunnions C of the barrel assembly and communicates with and supports the manifold or distributing head L through which the abrasive laden air or other gas is fed to produce the sand blast. The distributing head L will be provided with a plurality of nozzles 45 through each of which a jet of abrasive laden air will escape to play upon objects in the barrel. In order to prevent any considerable quantity of air from entering the barrel through the trunnion at which the pipe K enters I provide: a sealing plate 46 which rotates with the barrel assembly and closely encircles although does not contact the pipe K.

The barrel assembly may include separable trunnions C secured to end plates 4'7 and 48 to which in turn are secured the walls which make up the barrel. The wall 48 may be secured to its trunnion C as by means of bolts 49, while the plate 47 is secured to its trunnion C by bolts 50. Secured to the end plate 4'7 as by bolts 51 is a large ring gear 35 driven as hereinbefore pointed out and being positioned closely adjacent but not in contact with the wall 37 of the chute P.

The end plates 47 and 4.8 are preferably octagonal in shape and have attached thereto perforated Walls 52 by means of the bolts 53. On one of the sides an imperforate door 54 of suitable construction will be substituted for the perforated plates 52. Extending around the seven sides and covering the seven perforated plates 52 is a cover member indicated generally by the numeral 55 and built to form faces indicated by the lower case letters a to g inclusive. The covering member 55 is preferably attached by the bolts 53 through flanges 56 and has its main central portion spaced from the perforated walls 52 whereby a complete sealing covering for said walls is provided. Each of the pairs of faces a b, c d and e f is provided with an angularly or diagonally extending partition 57 and the face 9 is provided with a shorter partition 58. Continuous with each partition and forming an extension thereof is a spout-like outlet means 59 which permits the escape of sand from the space 60 between the cover member 55 and the perforated walls 52 through openings 61 in the gear 35 into the chute P. It will be observed that the sand or other abrasive is carried by the chutes 59 which pass through the openings 61 in the gear 35. Abrasive will escape into the chute P only at certain portions of the revolution of that chute for which reason the arcuate Walls 35 and 37 need extend only part way around the barrel.

The operation will now be described:

After a charge of objects to be sand blasted has been placed within the barrel, the door 5% is tightly closed and the valve operating handle N is moved to open the valve M. A switch is then closed, which starts the motor 26, and the sources of pressure and suction are set into operation if they have been turned 01f. Compressed air car-- rying considerable quantities of sand or other abrasive from the compression chamber J will be forced through the conduit K and pipe K to the distributing head L from which it escapes in jets through the nozzles 45 and impinges upon the The source of suction in connection with the dust collector will cause air to be sucked through the pipes F and O, which will result in pulling air into the top of the hopper E and through the spouts 59 into the space 60, then through the perforations in neeasve the plates 52 and out through the right-hand trunnion C into the conduit 0. These suctions will result in thoroughly washing the abrasive in the barrel assembly T and as it passes through the hopper E, a double washing. Sand or other abrasive which has escaped through the nozzles 45 will gradually work through the perforations in the plates 52 into the space 60 from which they will be directed by the oblique partitions 5''! into the spouts 59 and thence into the chute P. Abrasive from the chute P will be delivered into the bottom of the elevator shaft D where it is picked up by buckets on the conveyor belt 19, carried to the top of the elevator shaft and discharged by centrifugal force into the hopper E. It will be observed that abrasive travels through the barrel in one direction from the nozzles 45 through the plates 52 and out through the spouts 59. Meanwhile, air travels therethrough in the other direction, entering the spouts 59, passing through the perforated plates 52 and escaping into the suction pipe 0. It will be observed that the suction pipe 0 is connected with the trunnion C by a trap 0 designed to catch any heavy material which may be drawn through the hollow trun- '1 nion and be too heavy to traverse the entire length of the pipe 0. The travelling of the air and sand in opposite directions through the sand blast barrel results in a very thorough washing and removes dust from the interior of the barrel 1 substantially as fast as it is formed.

The octagonal shape of the sand blast barrel will result in the articles constituting the charge together with a certain amount of abrasive being carried up and turned over and will prevent '1 slipping back of the same to the bottom as is apt to be the case if a circular barrel is provided. This is especially important since the abrasive carried in the sand blast barrel will result in polishing the interior thereof to a high degree of 1 smoothness.

While I have described the preferred illustrative forms of my invention, I wish it understood that I am not limited to the details of such forms, but may carry out my invention in various forms1 within the scope of the appended claims.

Having thus described my invention, what I claim is:

1. In a system of the type described, a sand blast barrel, means for spraying abrasive against 1 objects therein, means for causing used abrasive to discharge from said barrel and means for causing air to flow into said barrel through the abrasive being discharged therefrom.

2. A sand blast barrel of the type described, means located within the barrel for spraying abrasive against objects therein, means for discharging the abrasive through the periphery of the barrel and means for drawing air into the barrel through the periphery thereof and across the discharging abrasive.

3. A system of the type described including: a sand blast barrel assembly having inner, perforate wall portions and outer imperforate cover means covering the perforate portions and spaced 1 therefrom, the space between said inner wall portion and said cover means being divided by one or more partitions and there being outlet means from said space; means for rotating said barrel assembly and chute means for receiving abrasive 1 r' SIDNEY C. VESSY. 

